JP4101135B2 - Busbar structure for connection between disconnectors - Google Patents

Description

  The present invention relates to a busbar structure that connects two disconnectors at a substation or the like.

  FIG. 4 shows a general bus and disconnector arrangement in a substation. In the figure, 10A and 10B are two disconnectors (one phase) installed at a required interval, 12 is a primary bus hung down between two disconnectors 10A and 10B, and 14A and 14B are disconnections. This is a secondary bus connected to the secondary side of the devices 10A and 10B. The disconnectors 10A and 10B have primary side contacts 16A and 16B, secondary side contacts 18A and 18B, and blades (movable contacts) 20A and 20B, respectively, attached to the upper end of the support insulator. The contacts 16A and 16B are arranged in series so that the contacts 16A and 16B are located on the inner end side and the secondary contacts 18A and 18B are located on the outer end side.

  The primary side contacts 16A and 16B of the disconnectors 10A and 10B are connected by a crossover bus 22. The primary bus 12 that is suspended from the steel tower 24 in the middle of the disconnectors 10 </ b> A and 10 </ b> B is connected to the middle of the crossover bus 22.

  As shown in FIG. 5, plate-like terminals 26A and 26B are compression connected to both ends of the crossover bus 22, and these plate-like terminals 26A and 26B are the primary side contacts 16A and 16B of the disconnectors 10A and 10B (see FIG. 4). Tightened to the connection. The lower end of the primary bus 12 is connected to the middle of the crossover bus 22 by a spring-type T-branch clamp 28.

  As shown in FIG. 6, the spring-type T-branch clamp 28 includes a main body 30 that is compressed and connected to the lower end of the primary bus 12, and a housing 32 that houses a spring 34 and a saddle 36. The housing 32 is slidably fitted to the main body 30 in a chopstick box manner. The spring-type T-branch clamp 28 is used to electrically connect the primary bus 12 and the crossover bus 22 by sandwiching the crossover bus 22 between the saddle 36 and the main body 30 and tightening with the repulsive force of the spring 34. .

  The crossover bus 22 is made of a twisted aluminum wire and has flexibility. However, if the installation distance between the two disconnectors 10A and 12B is narrow, the exposed length of the crossover bus 22 is shortened. Sexuality is impaired. As a result, the primary side contacts 16A, 16B of the disconnectors 10A, 10B become close to the state where they are connected by the crossover bus 22, and in the event of an earthquake or typhoon, the insulators that support the primary side contacts 16A, 16B are excessive. A large external force was applied and the insulator was tilted, making it impossible to open and close the disconnector.

  In order to solve this problem, it is necessary to remove the spring-type T-branch clamp and replace the crossover bus and the primary bus, resulting in a large construction. In addition, since construction is often performed with either one of the secondary buses 14A and 14B energized, it is dangerous to perform construction near the energized secondary bus. There is.

  An object of the present invention is to provide a disconnector connecting bus structure that solves the above-described problems.

In order to achieve this object, the present invention suspends a primary bus in the middle of two disconnectors installed at a required interval, and a T-branch fitting attached to the lower end of the primary bus and the two A busbar structure that electrically connects the disconnector,
The T-branch metal fitting is a pair of slide rails whose vertical bar portion is formed of a cylindrical portion that is compression-connected to the lower end of the primary bus, and whose horizontal bar portion extends downward in the longitudinal direction of the horizontal bar portion. Comprising
Two sets of connection units are used in which a plate-like terminal is attached to one end of a curved flexible conductor and a block terminal having a side protrusion that is slidably fitted to the slide rail portion of the T-branch bracket is attached to the other end. The plate terminal of the connection unit is connected to one disconnector, the block terminal is slid and fitted to the slide rail portion of the T-branch bracket from one end side, and the plate terminal of the other connection unit is connected to the other disconnector. The block terminal is slidably fitted to the slide rail portion of the T-branch bracket from the other end, and the T-branch bracket and two block terminals slidably fitted thereto are welded. It is.

  Since the busbar structure for connecting disconnectors according to the present invention is configured as described above, the following effects are obtained. That is, even if the distance between the two disconnectors is narrow, the flexible conductor can have sufficient flexibility. Therefore, even if the two disconnectors and the primary bus are relatively displaced due to an earthquake or typhoon, etc. The displacement can be absorbed by the flexible conductor. For this reason, an excessive external force is not applied to the insulator of the disconnector, and the inclination of the insulator can be prevented.

As T splitter hardware attached to the lower end of the primary bus, so can use the main body portion of the spring T branch clamp, even when retrofitting the existing bus, there is no need to Harikaeru the primary bus, a small construction Can be done at low cost on a scale. Also, since two sets of connection units need only be connected in sequence, when one secondary bus is energized, work is performed on the other secondary bus, and the other secondary bus is energized. In some cases, construction can be performed on one secondary bus side, and the necessity of approaching the secondary bus in the energized state is reduced, and the risk of construction can be reduced.

1 and 2 show an embodiment of the present invention. In the figure, 12 is a primary bus hung in the middle of two disconnectors, 30 is a main part of a spring-type T-branch clamp attached to the lower end of the primary bus 12, and these are the same as before. . In this embodiment, the main body 30 of a spring-type T-branch clamp shown in FIG. 6 is used as a T-branch fitting.

The bus bar structure uses two sets of connection units 38A and 38B to connect the two disconnectors. Each connection unit 38A, 38B is a plate-like terminal 42 one end of the flexible conductor 40 which is curved, a structure fitted with a lube lock pin 44 to slide fit match to the main body portion 30 of the spring-loaded T-branch clamp at the other end is there.

  The flexible conductor 40 is made of an aluminum stranded wire and is curved upward in order to obtain sufficient flexibility at a narrow interval.

  The sleeve portion 42a of the plate-like terminal 42 is formed so that the insertion opening of the flexible conductor 40 faces upward in order to sufficiently curve the flexible conductor 40. The flexible conductor 40 is connected to the plate-like terminal 42 by inserting a wedge into the sleeve part 42a, driving a wedge from the end face, and welding the end face to the sleeve part 42. In this way, the length of the sleeve portion 42a can be made shorter than in the case of compression connection, and the flexibility of the flexible conductor 40 can be improved.

  The block terminal 44 has a structure as shown in FIG. That is, it is a short cylindrical shape having a hole 46 for inserting a flexible conductor at the center, and the upper surface enters the conductor gripping groove 48 (see FIG. 2A) of the spring-type T-branch clamp body 30 in the same direction as the hole 46 on the upper surface. It has a protrusion 50 and has side protrusions 54 that engage with slide rail portions 52 (see FIG. 2A) of the spring-type T-branch clamp main body 30 on both side surfaces. Accordingly, the block terminal 44 can be slidably fitted to the spring-type T-branch clamp main body 30.

  In this block terminal 44, after inserting the flexible conductor 40 into the hole 46 from the left end side of FIG. 3B, a wedge is driven in from the end surface of the flexible conductor 40 to expand the diameter of the end of the flexible conductor 40. The end face of 40 and the end of the block terminal 44 are attached to the flexible conductor 40 by overlay welding.

  The two sets of connection units 38A and 38B configured as described above are used, and one set of the connection units 38A connects the plate-like terminal 42 to the primary contact (16A in FIG. 4) of one disconnector. At the same time, the block terminal 44 is slid and fitted to the spring-type T-branch clamp body 30 from one end side. The other set of connection units 38B connects the plate terminal 42 to the primary contact (16B in FIG. 4) of the other disconnector, and slides the block terminal 44 to the spring-type T-branch clamp body 30 from the other end. Mating. In this state, the spring-type T-branch clamp main body 30 and the two block terminals 44 and 44 slidably fitted thereto are connected by welding. 56 is the weld. Thus, the primary bus 12 and the flexible conductors 40 and 40 are electrically and mechanically connected.

BRIEF DESCRIPTION OF THE DRAWINGS One Embodiment of the bus-bar structure for connection between disconnectors which concerns on this invention is shown, (a) is a top view, (b) is a front view. The structure of the intermediate part of the bus-bar structure of FIG. 1 is shown, (a) is a side view, (b) is a bottom view. (A) is a plan view, (B) is a front view, (c) is a bottom view, (d) is a left side view, and (e) is a right side view of the block terminals used in the bus bar structure of FIG. The front view which shows arrangement | positioning of the bus-line and disconnecting switch of a substation. The conventional bus-bar structure for connection between disconnectors is shown, (a) is a top view, (b) is a front view. FIG. 6A is a front view and FIG. 5B is a side view of a spring-type T-branch clamp used in the bus bar structure of FIG. 5.

Explanation of symbols

10A, 10B: Disconnector
12: Primary bus
14A, 14B: Secondary bus
16A, 16B: Primary contact
18A, 18B: Secondary contact
20A, 20B: Blade
28: Spring-type T-branch clamp
30: Body
32: Housing
38A, 38B: Connection unit
40: Flexible conductor
42: Plate terminal
44: Block terminal
56: Welded part

Claims (1)

A primary bus is suspended between two disconnectors installed at a required interval, and a T-branch fitting attached to the lower end of the primary bus is electrically connected to the two disconnectors. A structure,
The T-branch metal fitting is a pair of slide rails whose vertical bar portion is formed of a cylindrical portion that is compression-connected to the lower end of the primary bus, and whose horizontal bar portion extends downward in the longitudinal direction of the horizontal bar portion. Comprising
Two sets of connection units are used in which a plate-like terminal is attached to one end of a curved flexible conductor and a block terminal having a side protrusion that is slidably fitted to the slide rail portion of the T-branch bracket is attached to the other end. The plate terminal of the connection unit is connected to one disconnector, the block terminal is slid and fitted to the slide rail portion of the T-branch bracket from one end side, and the plate terminal of the other connection unit is connected to the other disconnector. And a block terminal is slidably fitted to the slide rail portion of the T-branch bracket from the other end side, and the T-branch bracket and two block terminals slidably fitted thereto are welded. Bus structure for inter-unit connection.

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